Grooving-saw.



Patented Sept. I8, I900.

No. 658,2l2.

J. MUGARRISON. GROOVING SAW.

(Application filed Apr. 7, 1900.)

2 Sheets-Shaot l (No Model.)

IN VEN TOR WITNESSES No. 658,2l2. Patented Sept. l8, I900. J. M. GABRISON.

GROOVING SAW.

{Application filed Api. 7, 1900.

mmm I Z'g- 6 .INVENTOH ..%m4 4 WIHlllmnmmum.H W232 W/ TNE SSE S ATTORNEYS UNITED STATES PATENT" OFFICE.

JAMES MAY GARRISON, OF SANTA BARBARA, CALIFORNIA.

GROOAVINVGV-SAYW.

SPECIFICATION formingpart of Letters Patent No. 658,212, dated September 18, 1900.

Application filed April 7, 1900.

To all whom it may concern:

Be it known'that I, JAMES MAY GARRISON, a citizen of the United States, and a residentof Santa Barbara, in the county of Santa Barbara and State of California, have invented a new and Improved'Grooving-Saw, and Dado-Head, of which the following is a full, clear, and exact description.

lhe invention relates to woodworking-machines; and its object is to provide a new and improved grooving-saw and dado-head, arranged to allow of conveniently and quickly setting the saw in a right or other angular position relative to the saw-arbor for cutting narrow or wide grooves, the construction of the saw permitting the formation of clean-cut grooves in any kind of wood.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of my inventionis represented in the accompanying-drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a face view of one side of the improvement. Fig. 2 is a like View of the other side of the same. Fig. 3 is a sectional plan view of the same on the line 3 3 of Fig. 1.

Fig. 4. is a transverse section of the same on the line 4 4 of Fig. 2. Fig. 5 is a plan view of the same. Fig. 6 is an enlarged sectional plan view of the adjusting-screw and part of the saw-blade. Fig. 7 is a perspective view of the washer. Fig. 8 is a plan view of the connecting-lever for the adjusting device. Fig. 9 is a plan view of the body of the dadohead, and Fig. 10 is a plan view of the improvement with the saw-blade set in an angular position relative to the axis of the arbor.

The eye A of the circular saw A fits loosely on the hub B of the dado-head body B, so that the saw-blade A can assume eithera rightangular position or any other angular posi tion relative to the axis of the dado-head and the saw-arbor. One face of the saw-blade A is engaged by a Washer O, abutting against a nut D, screwing on the threaded end of the hub B, and the otherface of the saw is engaged at diametricallyopposite points by seal u 11,964. \No model.)

lugs B extending from the dado-head body B, as is plainly indicated in Figs. 4 and 5.

At points located at right angles to the lugs B are arranged ad justingdevices for the sawblade, the said adjusting devices consisting,

as'shown, of an adjusting-screWE, screwing in the body B, and a pin F free to slide in the said body, as is plainly indicated in Figs.

3 and 5,\the said screw and pin being located diametrically opposite each other to engage the saw-bladeat opposite sides and at right angles tothe lugs B above mentioned. The adjusting-screw E is provided with a collar E for engagingthe face of the blade A opposite to where the washer O is located, and on said adjusting-screw screws the nuts E one of which engages the face of the saw-blade blade when the latter is moved into a tilted or angular posit-ion, as indicated in .Fig. 10. The faces of the lugs B are similarly beveled, as shown in Fig. 5, for a like purpose.

The inner end of the adjusting-screw E abuts against a lever G in the form of a ring fulcrumed at G on bolts secured to the body B, thesatid ring-shaped lever being engaged by the inner end of the pin F on the sideopposite where the adjusting-screw E engages the said lever. Now it is evident that when the adjusting-screw E is screwed inward, for instance, a swinging motion is given to the lever G, whereby the other side of the lever moves the pin F ontward,and this movement corresponds to the inward movement of the adj listing-screw E. It is evident that when this takes place the saw-blade A is moved into an, angular position for cutting wider grooves, the width of the grooves corresponding to the amount of tilt given to the sawblade by adjusting the screw E, as above described.

One portion of the face of the washer O is beveled, as indicated at Oi toinsure engagement of the face of the saw-blade by the said Washer when adjustment takes place.

IClOv The v claim as new and desire to secure byfltetters to allow of proper engagement of the clampwasher G is held against turning by pins B 1 forming part of the body B and located adjacent to the lugs B the said pins B engaging corresponding slots C, formed in the washer O, as indicated in Fig. 7. It is expressly understood that by having the con- 1 nection between the adjusting-screw E and the pin F the latter is moved a distance corresponding to the distance the screw E is screwed into or out of the head B, with the difference that the inward movement of the screw causes an outward movement of the; pin and an outward movement of thescrew causes an inward movement of the pin. the foregoing it is evident that the mere ad- From justment of the screw E causes a proper setting of the saw-blade to the desired angle that is, according to the width of the groove E to be cut.

the saw-blade A, whether in a right-angular or other angular position, is always engaged at four points on one face, soas to insure a proper holding of the saw-blade on the dado- 5 head to insure correct cutting by the sawblade.

In order to produce very clean cuts in wood of any kind,.I prefer to provide pairs of 'opl positely-arranged teeth with. a web A, having a sharp cutting edge slightly toothed, as

indicated in Figs. 1 and 2, with the cutting edge of one web in alinement with one face 5 of the saw-blade and that of the other web f in alinement with the other face of the sawi The cutting edges of the said webs blade.

also extend slightly beyond the point of the saw-teeth, so that the side walls of the groove cut into the wood are trimmed very accurately, thereby insuring a very clean cut in the wood.

Having thus described my invention, I

Patent- 1. A dado-head comprising a body having 5 a hub forming a bearing for the saw-blade and adjusting devices for engaging the saw-blade i at opposite sides of its center, and a connection between the adjusting devices, so ar ranged that when one of the devices is ad-'' justed, the said connection is automatically moved and correspondingly adjusts the other device, substantially as shown and described.

2. A dado-head, comprising a body having 3 a hub forming a bearing forthe saw-blade, the

said dado-head having oppositely-located sup- 1 ports for one face of the saw-blade, a washer for engaging the opposite face, adjusting devices for engaging the saw at opposite sides of the head-supportin g devices, and a connec- 2 tion between the said adjusting devices, so arranged that when one of the devices is adjusted the other connection is moved-and correspondingly adjusts the other device, substantially as shown and described.

3. A dado-head, having an adjusting-screw and a pin for engagement with the saw-blade on opposite sides of its center, and a lever 'fulcrumed on the head and engaged by the said screw and the said pin, the lever being so arranged that the adjustment of the said adjusting-screw causes a corresponding adjustment of the pin but in an opposite direc- .ti.on,.substantially as shown and described.

4. A dado-head, comprising a body for at tachment to the saw-arbor, lugs carried by the bodyfor engagement with one face of the sawblade, a washer carried by the said head for engagement with the other face of the sawblade, the said washer being beveled at one side, and adjusting devices for holding the saw-bladein position at right angles or other angles relatively to the axis of the dado-head, the said devices comprising an adjustingscrew screwing in the head, a pin sliding in the head,and a lever fulcrumed on the head and engaged at opposite sides by the said screw and the said pin, substantially as shown and described.

5. A dado-head, comprising a body for attachment 'to t hesaw-arbor, lugs carried by the body foren-gagen'teut with one face of the sawblade, a washer carried by the said head for engagement with the other face of the. sawblade, the said washer being beveled at one side, and adjusting devices for holding the saw-blade in position at right angles or other angles relatively to the axis of the dad o-head, the said devices comprising an adjustingscrew screwing .in the head, a pin sliding in the head, and a lever fulcrumed on the head and engaged at opposite sides by the said screw and the said pin, the said adjustingscrew having a collar and adjusting-nuts, as set forth.

6. A saw-blade, provided with recesses in ICO its faces, and clamping mechanism engaging 1 said recesses to hold the saw-blade in position, the bottoms of the recesses being beveled ing mechanism with the saw-blade when the latter is moved into a tilted or angular position, substantially as shown and described.

beveled for engagement by parts of the said screw, substantially as shown and described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES MAY GARRISON.

Witnesses:

ALrHoNsE CRANE, WM. G. GRIFFITH. 

